Actually that’s not CPU0 ... it's the average value over all CPU(s) as topexplicit shows. To toggle the display mode to show all CPUs separatelypress '1'. and 'h' shows all available commands....

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Find Linux CPU utilization using mpstat and other tools (#mpstat -P ALL  Will show all processors utilization)Please note that you need to install special package called sysstat to take advantage of above commands. This package includes system performance tools for Linux (Red Hat Linux / RHEL includes these tools by default).Step by step guide below..